Question on tires air pressure gauge

[FUNX650]

I’ve used the below inflator, with a snap-up gauge,
for ~34 years: it’s extremely accurate where the
barometric pressure (psia) is 14.25—along with
other thermodynamic properties pertinent to my
region of the U.S.A.




Bob

[java]

I’ve used the below inflator, with a snap-up gauge,
for ~34 years: it’s extremely accurate where the
barometric pressure (psia) is 14.25—along with
other thermodynamic properties pertinent to my
region of the U.S.A.




Bob

Do they still make those pressure gauge today? I seen that gauge in over 15 years.

[SWETM]

If your readings is consistant lower between the TPMS and the air pressure gauge. It could just be a calibration wrong from the air pressure gauge. Also if you only read with the air pressure gauge daily and the pressure lowers. It can be the little air that goes out from the tires when putting the air pressure gauge on and off. You have those pen style air pressure readers that useally is good and you can see how much air goes out when you do your readings. And maybe see how much of psi that goes out when doing this. So when you put your air pressure gauge on I useally pump up the pressure and then release pressure to just above to what I want. Some air pressure gauges need to be used in some way either let air pressure out and pump up to the wanted pressure or as I mentioned before.

If you get very different readings from lower to higher with about the same temperature when doing them. Your seals in the air pressure gauge is proberly worn out. Some of the finer air pressure handles you can get calibrated. Then it's just too see if your cars TPMS is accurate calibrated.

You would not be seeing any warnings from the TPMS from day to day. If they don't is so sensitive that the climate change would set them off. What does the manual on the car says about your TPMS. Cause if you loose air pressure you would have a small leak. Does the TPMS warn you when you start your car or when you driving?

[spazzz]

What does the door tag say for recommended PSI?

and did you initialize the system since you got the car?

[vincec]

I use an Accutire MS-4021B Tire Pressure Gauge to check pressure and as others have stated, the outside temperature has a direct effect on the TPMS readings and the tire pressure in general. I have two of these gauges and will sometimes verify one against the other to determine calibration.

The rule of thumb is for every 10° Fahrenheit change in air temperature, tire pressures will change about 2% (up with higher temperatures and down with lower). This means that light-duty, standard-pressure tires (typically inflated to 30-50 psi) used in applications on cars, vans and light trucks will change by about 1 psi; where heavy-duty, high-pressure tires (typically inflated to 80-100 psi) used in applications on recreational vehicles, buses and trucks will change by about 2 psi.

I have a 2018 Durango and slightly overfill the tires and then bleed off the pressure until they are all at 40 psi on the gauge. I've found the TPMS reading to be dead on for all the tires if you carefully bleed them down. Because this gauge reads to .5 psi increments you can sneak up on the reading you what letting very small amounts of air out with a quick push and release on the gauge. While driving the tire temps will increase and not all at the same rate sometimes based on heat from brakes, etc. I have the same TPMS system on a 2015 Durango and 2015 Ram and normally top off the pressure as the seasons change. I've found them to be pretty accurate.

[Calendyr]

Which tire gauge are you using?

No idea. Purchased it at Canadian Tire for 20$. It's in the car so I can't check.

[FUNX650]

Do they still make those pressure gauge today?
I seen that gauge in over 15 years.

I’ll take a stroll down good ol’ Google Lane.




Bob

[FUNX650]

Do they still make those pressure gauge today?
I seen that gauge in over 15 years.

I’ll take a stroll down good ol’ Google Lane.

Yep, they are out there:




Bob

[java]

What does the door tag say for recommended PSI?

and did you initialize the system since you got the car?

I went by the door tag on recommended air pressure.

What does initialize the system means?

I mentioned about the TPMS at the dealer while it was getting it oil change. The service tech hook it up to the computer but could find anything wrong with the system.

[java]

Yep, they are out there:




Bob

Do you remember the gauge with the bubble looking glass to magnified the PSI numbers?